521342240 has 24 divisors (see below), whose sum is σ = 1231671420. Its totient is φ = 208536832.

The previous prime is 521342203. The next prime is 521342243. The reversal of 521342240 is 42243125.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 502297744 + 19044496 = 22412^2 + 4364^2 .

It is not an unprimeable number, because it can be changed into a prime (521342243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1629035 + ... + 1629354.

Almost surely, 2^521342240 is an apocalyptic number.

It is an amenable number.

521342240 is an abundant number, since it is smaller than the sum of its proper divisors (710329180).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

521342240 is a wasteful number, since it uses less digits than its factorization.

521342240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3258404 (or 3258396 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 521342240 is about 22832.9200935842. The cubic root of 521342240 is about 804.8364519929.

Adding to 521342240 its reverse (42243125), we get a palindrome (563585365).

The spelling of 521342240 in words is "five hundred twenty-one million, three hundred forty-two thousand, two hundred forty".